2A672 Volume 2 Ure Part 2

The probable cause for the table on the MHU lift truck to tilt without changing the position on the control valve is a tilt cylinder leak. This means that there is a leak in the cylinder responsible for controlling the tilt of the table, causing it to tilt unintentionally.

Air in the hydraulic system can cause erratic operation of the MJ-2A-1 hydraulic test stand. When air enters the system, it can create air pockets or bubbles that disrupt the flow of hydraulic fluid. This can result in inconsistent pressure and flow, leading to unpredictable operation of the test stand. To resolve this issue, it is necessary to bleed the air out of the system and ensure that it is properly filled with hydraulic fluid.

The thermal relief valve is the component that prevents thermal expansion of the hydraulic fluid from rupturing a hydraulic line. Thermal expansion occurs when the temperature of the fluid increases, causing it to expand and potentially build up excessive pressure in the system. The thermal relief valve is designed to relieve this pressure by opening and allowing the excess fluid to escape, thus preventing any damage or rupture to the hydraulic line.

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The item manager and equipment specialist are responsible for determining the length of time it is considered economically feasible to repair a piece of equipment. They have the expertise and knowledge to assess the costs involved in repairing the equipment and determine if it is more cost-effective to repair or replace it. They consider factors such as the cost of repairs, the expected lifespan of the equipment after repairs, and the availability of replacement parts. Ultimately, their decision is based on what makes the most financial sense for the organization.

The auxiliary air system on the SGNSC provides low pressure air for pneumatic tools. This means that it supplies air at a lower pressure to power tools that operate using compressed air.

The fill switch, LS4, provides an alternate means of energizing the fill pump when either of the microswitches is defective. This means that if either of the microswitches fails, the fill switch can be used as a backup to activate the fill pump.

The SGNSC components ASM1 and ASM2 are responsible for separating nitrogen from oxygen.

The high-pressure relief valve must be readjusted any time the high-pressure pump compensator setting is changed. This is because the high-pressure relief valve is responsible for regulating the pressure in the system and preventing it from exceeding safe levels. When the compensator setting is changed, it affects the overall pressure in the system, and therefore the high-pressure relief valve needs to be readjusted to ensure that it is still functioning properly and maintaining the correct pressure levels.

The heater/combustion section of the new generation heater (NGH) is operated by a 120 VAC power source. This means that the heater requires a standard electrical power supply of 120 volts alternating current to function properly.

To set the volume output of the hydraulic test stand, the bypass valve must be open. The bypass valve allows the fluid to bypass the main system and flow directly back to the reservoir. By adjusting the bypass valve, the volume of fluid flowing through the system can be controlled, thereby setting the desired output volume.

The photocell on the new generation heater (NGH) verifies the flame in the burner tube by detecting the presence of light. When light is present, the resistance of the photocell decreases. This change in resistance is used as a signal to indicate that the flame is present and functioning properly.

The oil pressure switch is responsible for monitoring the oil pressure in the engine system. In the event of an engine system malfunction, such as low oil pressure, the oil pressure switch will detect this and activate the warning horn to alert the operator. This safety device ensures that any issues with the engine system are quickly identified and addressed to prevent further damage or accidents.

The air/fuel ratio is the correct answer because it refers to the balance between the amount of air and fuel being mixed in the combustion section of the new generation heater (NGH). A proper air/fuel ratio ensures that there is enough oxygen for complete combustion of the fuel, preventing the formation of carbon deposits or coking. If the air/fuel ratio is too rich (excess fuel), it can lead to incomplete combustion and coking. On the other hand, if the ratio is too lean (excess air), it can cause high temperatures and potential damage to the heater. Therefore, maintaining the correct air/fuel ratio is crucial to prevent coking.

The correct answer is the tilt control valve. During a load test of an MHU lift truck, the operator changes the level of the table by adjusting the position of the tilt control valve. This valve controls the angle of the lifting mechanism and allows the operator to tilt the table forwards or backwards to adjust the position of the load. By changing the position of the tilt control valve, the operator can ensure that the load is properly balanced and positioned for safe and efficient lifting and transporting.

The probable cause when the MJ-1B lift truck engine does not start is a blown 20 amp fuse.

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A defective control cable could be the probable cause for the split deck maintenance platform not lowering. If the control cable is damaged or malfunctioning, it may prevent the platform from responding to the lowering command. This could be due to issues such as broken wires, loose connections, or internal damage within the cable. It is important to inspect and repair or replace the control cable to ensure proper functioning of the platform.

The heat boost system on the ACE802S air conditioner uses engine coolant to trim the output air temperature. Engine coolant is a liquid that circulates through the engine to absorb heat and prevent overheating. By utilizing the engine coolant, the air conditioner can adjust the temperature of the output air to provide the desired level of heating.

Vapor injection is the ACE 802S air conditioner system that "supercharges" the compressor. This means that vapor injection technology is used in this system to enhance the performance of the compressor. By injecting vapor into the compressor, it helps to improve the cooling capacity and efficiency of the air conditioner. This technology allows the compressor to operate at higher pressures, resulting in improved cooling performance and energy efficiency.

The valve that must be opened prior to starting the engine on the ACE 802S air conditioner system is the air shutoff valve. This valve allows air to flow into the system, which is necessary for the engine to start and function properly. By opening the air shutoff valve, the necessary air supply is provided to the engine, allowing it to start and run smoothly.

The platform on the split deck maintenance platform is lowered in the event of electrical failure by using accumulator pressure to operate the down pilot check valve. This means that even if there is a loss of electrical power, the accumulator will still have stored pressure that can be used to lower the platform safely.

The orifice fitting controls the platform's descent rate on the split deck maintenance platform. An orifice fitting is a device that restricts the flow of fluid, in this case, hydraulic fluid, to regulate the speed at which the platform descends. By controlling the flow rate, the orifice fitting ensures a safe and controlled descent of the platform.

The lower scissor wheel travel limit switch is responsible for establishing the maximum platform elevation on a split deck maintenance platform. This switch is designed to detect and restrict the movement of the scissor wheels, preventing the platform from exceeding its safe elevation limit. By activating when the wheels reach their lowest point, the switch ensures that the platform cannot be raised any further, thus establishing the maximum elevation.

The programmable logic controller circuit is responsible for determining the speed of the nitrogen booster compressor. This circuit controls and regulates the operation of the compressor by adjusting the input signals and controlling the output signals to maintain the desired speed. It monitors various parameters and uses pre-programmed logic to make necessary adjustments to maintain the optimal speed of the compressor.

AF Form 457 is used to report a hazardous condition. This form is specifically designed for reporting unsafe or hazardous conditions in the Air Force. It allows personnel to document and report any potential dangers or risks that could harm individuals or equipment. By using this form, the Air Force can take appropriate action to mitigate the hazard and ensure the safety of personnel and resources.

The correct answer is that the heater control unit (HCU) uses outlet air sensors to compare air temperature with the programmed value, cycling the fuel burner on and off to maintain the temperature. This means that the HCU constantly monitors the outlet air temperature and adjusts the fuel burner accordingly to keep the temperature within the desired range. By cycling the fuel burner on and off, the HCU can effectively regulate the output air temperature and ensure it stays within the programmed limits.

To prevent rupturing the filters on the MJ-2A-1 hydraulic test stand when the fluid temperature is below 70 degrees F, the heat exchanger bypass valve should be opened. This is because opening the bypass valve allows the fluid to bypass the heat exchanger, which helps to prevent the fluid from becoming too cold and potentially causing damage to the filters. By opening the bypass valve, the fluid can flow directly through the system without being cooled by the heat exchanger, ensuring the filters are not at risk of rupturing.

The correct answer is "force fluid to flow into the low-pressure system." When the system selector valve is placed in the AIRCRAFT position during the fill-and-bleed operation, it allows the fluid to flow into the low-pressure system. This is necessary to ensure that the system is properly filled and any air or contaminants are bled out. Placing the valve in this position directs the fluid specifically to the low-pressure system, ensuring that it is properly pressurized and functioning correctly.

The AFTO Form 375 is submitted by the maintenance organization to the MAJCOM HQ. This form is used to request maintenance actions, such as repairs or replacements, for equipment. The MAJCOM HQ is responsible for overseeing and coordinating maintenance activities at the major command level, so it is the appropriate entity to receive and process the AFTO Form 375. The item manager, equipment specialist, and uniform repair/replacement board may be involved in the maintenance process, but they are not the recipients of the AFTO Form 375.

The correct answer is "RUN." In the RUN position, the engine switch energizes the electric fuel pump, fuel solenoid, and regulator. This allows the fuel pump to deliver fuel to the engine, the fuel solenoid to control the flow of fuel, and the regulator to maintain the proper fuel pressure. The other options, MODE, START, and DRIVE, do not perform these functions.

The first troubleshooting step that must be accomplished when a unit comes in with a write-up in the forms is to recognize the write-up as a malfunction. This means acknowledging that there is a reported issue or problem with the unit. By recognizing the write-up as a malfunction, the technician can then proceed with further troubleshooting steps to diagnose and address the specific problem.

The correct answer is 132 psi. The thermal relief valve is designed to relieve excess pressure in the hydraulic system to prevent damage. In this case, the reservoir began to drain, indicating that the pressure in the system was too high and causing fluid loss. By analyzing the hydraulic flow charts, it can be determined that the thermal relief valve was set to 132 psi, which was not sufficient to prevent the pressure from exceeding safe levels.

If the HM2 fails to operate during SGNSC operation, it suggests that there may be a problem with the connection at terminal 4 of SW3.

The correct answer is "shifter solenoid is de-energized". This means that the solenoid responsible for controlling the shifting of the directional control lever is not receiving power or has lost power. As a result, the lever is stuck and unable to change direction.

The correct answer is 2,000 psi. This means that the maximum output pressure of the MHU-83C/E lift truck's hydraulic control valves is 2,000 pounds per square inch. This indicates that the lift truck's hydraulic system is capable of generating significant force, allowing it to lift heavy loads efficiently.

The compressor and expansion valve are the components that divide the refrigerant system high-pressure side from the low-pressure side. The compressor is responsible for compressing the refrigerant and increasing its pressure, while the expansion valve is responsible for regulating the flow of refrigerant into the evaporator, where it expands and cools down. Together, these components ensure that the high-pressure side and low-pressure side of the refrigerant system are separated, allowing for efficient cooling.

When troubleshooting a defective new generation heater (NGH) charging system, the first component to check is the ignition switch. The ignition switch controls the flow of electricity to the charging system, so if it is faulty, it can prevent the NGH from charging properly. By checking the ignition switch first, you can determine if it is the cause of the problem and proceed with further troubleshooting if necessary.

The correct answer is alternator output. During normal operation, the starter solenoid on the SGNSC disengages when the alternator output is detected. This is because once the alternator starts generating electricity, it takes over the power supply to the vehicle's electrical systems, including the starter motor. As a result, the starter solenoid is no longer needed to engage the starter motor, and it disengages to prevent unnecessary power consumption and potential damage to the solenoid.

The probable cause for one lift arm lowering slower than the other is that the overcenter valves are out of adjustment. These valves are responsible for maintaining the balance and stability of the lift arm during operation. If they are not properly adjusted, it can result in uneven lowering of the lift arm. This issue can be resolved by adjusting the overcenter valves to ensure equal and synchronized movement of both lift arms.